where to find the cheapest threaded track/ road frame??

I am building a Single Speed commuter out of left over parts/free parts and all i need is a frame that takes a threaded fork and headset. I had a frame all ready to go, then i found out the head tube was some old random size that they dont make headsets for. Also it was in really bad condition. Where can i find a super cheap frame around 52cm size that takes a threaded headset? or should i just go to salvation army and get one of there old crappy mtb bikes and strip it for the frame?

depends on what you want. Craigslist free section is always nice, classifieds and all the salvos and thrift stores around. Check if you have a bike coop around you, ask them if they have any frames also.

I already got my frame^^^^^ check the pics. I already have a fixie, this frame is for my beater single speed commuter that can get locked up for long periods of time and might also have a basket on the front.

My roomate has a Caliente. It's the heaviest bike I've ever seen, even after converting to single speed. His has a freewheel in the bottom bracket. I told him just to thread on a fixed cog instead of the freewheel. He doesn't care enough to change anything unless it breaks.

Well i got a threaded Profile Design h2o stem for the Caliente, Ody 13t freewheel, 36t T1 sprocket, and a pair of 3 piece GT cranks with a new 20mm euro bottom bracket, and a pair of newer flipped and cut bull horn handle bars for it. So those parts will make it a lot lighter, and i might buy a new cheap alum wheel set so i can use the freewheel and sprocket. A pictorial build up will come after thanks giving.

well, i think i am gonna get some FMF Bmx racing hubs that are 3/8 36 hole front and back come with 13-16 freewheel for 40 bucks, and get some deep vs maybe or something cheap. My question is will the BMX hubs axle be long enough or short enough to work? Or is there something else i am forgetting about for compatibility? I think it would be a super original set up that few have done.
here is the link to the hubs http://www.danscomp.com/426111.php?cat=PARTS